若函数f(x)在点处可导，则在点处(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='3168' and id < 245698 and id<>'245698' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='3168' and id > 245698 and id<>'245698' order by id asc limit 5